Is AP2A2 p.Ala136Ser (c.406G>T) pathogenic?

AP2A2 p.Ala136Ser (c.406G>T) is classified Uncertain significance in AP2A2 (ClinVar, Single submitter, 1 submitter; last evaluated 2021-07-09). AlphaMissense: likely benign (0.1893); Ultra-rare (popmax 0.0181%, nfe).

How common is AP2A2 p.Ala136Ser (c.406G>T) in the general population?

AP2A2 p.Ala136Ser (c.406G>T) is ultra-rare (popmax 0.0181%, nfe) (gnomAD).

What do computational predictors say about AP2A2 p.Ala136Ser (c.406G>T)?

AlphaMissense predicts likely benign (score 0.1893) — an in-silico prediction, not a clinical call.

AP2A2 p.Ala136Ser

c.406G>T · rs763389818 · VCV2232207

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1893 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0181%, nfe)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.1893	likely benign
REVEL	0.268	benign-leaning
SaProt	LLR -8.64	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 12	GERP 2, phastCons 1
Regional constraint	o/e 0.72	unconstrained · MANE · 22 kb · p 5.3e-10 · regional, not allelic
Overall
CADD	27.6	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0181% European (non-Finnish) · 213/1,179,596 alleles

Filtering AF 0.016% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0152%

Overall 0.0138% 222/1,612,148 alleles · ultra-rare

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.0181%	5,538
Remaining individualsnot grpmax-eligible	0.00641%	15,606
African / African-American	0.00534%	18,736
South Asian	0.0011%	90,966

Rarity supports pathogenicity (ACMG PM2); frequency above a disease-specific BA1/BS1 threshold argues against it. A variant frequent in one ancestry group can be near-absent in others, so a single global figure can mislead.

Variant & gene context

Gene: AP2A2
Protein: p.Ala136Ser
Coding: c.406G>T
MANE Select: NM_012305
dbSNP: rs763389818
Type: single nucleotide variant
Location: chr11:972188 (GRCh38)
Gene constraint: LOEUF 0.437 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 85.30

Full AP2A2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

AP2A2 p.Ala136Thr Uncertain significance ★ ⚠ same residue
AP2A2 p.Ala168Thr Uncertain significance ★ ⚠ same type
AP2A2 p.Ala274Pro Uncertain significance ★ ⚠ same type
AP2A2 p.Ala304Val Uncertain significance ★ ⚠ same type
AP2A2 p.Ala375Thr Uncertain significance ★ ⚠ same type
AP2A2 p.Ala3Val Uncertain significance ★ ⚠ same type
AP2A2 p.Ala435Val Uncertain significance ★ ⚠ same type
AP2A2 p.Ala488Thr Uncertain significance ★ ⚠ same type

Built on 18 open, versioned datasets — ClinVar, gnomAD, AlphaMissense, REVEL, ClinGen & more — plus Sugi Variant's own cross-source analysis. Source data 2026-01–2026-10, ClinVar 2026-10. Full sources & versions →

Cite Sugi Variant

Gür T. Sugi Variant: A Deterministic Per-Variant Germline Reference from a Knowledge Graph for Humans and AI Agents. 2026. doi:10.5281/zenodo.21509445. This variant: https://sugi.bio/variant/ap2a2-p-ala136ser (accessed [today's date]).

Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown